Synthesis of Cs₃MnBr₅ Green Phosphors Using an Eco-Friendly Evaporative Crystallization Process

Area of Science:

• Materials Science
• Nanotechnology
• Green Chemistry

Background:

• Green and red light-emitting materials like quantum dots and perovskites are crucial for displays and lighting.
• Current materials often contain toxic elements (Pb, Cd) and require harsh synthesis conditions (solvents, high T/P, long times).

Purpose of the Study:

• To develop an environmentally friendly synthesis method for lead-free Cs3MnBr5 green phosphors.
• To evaluate the optical properties of the synthesized Cs3MnBr5 for potential use as a green-emitting material.

Main Methods:

• Evaporative crystallization of an aqueous reactant solution.
• Synthesis involved low reaction temperature (150 °C) and short reaction time (2 h) under air.
• Utilized syringe-filtered solution (200 nm).

Main Results:

• Successfully synthesized lead-free Cs3MnBr5 green powder phosphor.
• Achieved excellent optical properties: 66.3% photoluminescence quantum yield, 520 nm peak wavelength, 38 nm bandwidth, 0.34 ms decay time.
• The synthesis avoided toxic elements and solvents, using mild conditions.

Conclusions:

• The developed evaporative crystallization is an eco-friendly and efficient method for Cs3MnBr5 synthesis.
• The synthesized Cs3MnBr5 phosphor exhibits competitive optical properties, making it a promising alternative to commercial green emitters.
• This work contributes to sustainable materials development for lighting and display applications.